Abstract
Precision measurements of CP violating observables in the decays of b and c hadrons are powerful probes to search for physics beyond the Standard Model. The most recent results on CP violation in the decay, mixing and interference of both b and c hadrons obtained by the LHCb Collaboration with Run I and years 2015-2016 of Run II are presented, including the first observation of CP violation in the charm system. In particular world best constraints and world first measurements are provided for CKM elements, unitarity angles and charm parameters. Prospects for future sensitivities are also discussed.
Highlights
Why do we study flavour physics? CPV is necessary condition to baryon asymmetry in the Universe. SM includes CPV in de CKM 3 × 3 matrix through a complex phase. SM CPV is not sufficient to explain matter–antimatter asymmetry. We look for new sources of CPV. Looking for SM deviations in an ’indirect’ way is complementary to direct production searchesCP violation in b and c at LHCb 10/09/2019
A = (−66 ± 4 ± 2)% S-wave rescattering amplitude. This contribution alone produces a CP asymmetry of (−66 ± 4 ± 2)%, which is the largest CP violation manifestation ever observed for a single amplitude
Decay is observed in the rescattering amplitude, this must be directly related to the total inclusive CP asymmetry observed in this channel, which was previously reported to be
Summary
We need at least 2 competitive interfering amplitudes with different weak (φ) and strong (δ) phases. A = (−66 ± 4 ± 2)% S-wave rescattering amplitude This contribution alone produces a CP asymmetry of (−66 ± 4 ± 2)%, which is the largest CP violation manifestation ever observed for a single amplitude. Decay is observed in the rescattering amplitude, this must be directly related to the total inclusive CP asymmetry observed in this channel, which was previously reported to be (−12.3 ± 2.1)% [1]. For the coupled channel B± → π±π+π−, with a branching fraction three times larger than thCaPt voifoBla±tio→nπin±Kb+aKn−d,caaptoLsHitCivbe CP10a/s0y9m/m20e1t9ry has been measured [42]. This gives consistency for the interpretation of the large CP V observed. Phase γ is measured throug0h.1 interference in B± → D K ± and in 0 d ,s decays
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